Hello all,
I have a wildcat cartridge in my collection I would like to ID correctly.
It is a 338 Lapua necked down to .308 with a shoulder angle of 30°. Case and body lenght and shoulder diam are the same as the parent cartridge.
The 300 Lapua magnum has a shoulder angle of 25°.
In the picture commercial 300 Lapua magnum ( left) and the unknown wildcat ( right)



Any help would be very appreciated

I have a drawing of a 30-338 Lapua. It has the same shoulder angle and length of the 338 Lapua. The 300 Lapua has a different shoulder angle.

I don’t know why someone would make that wildcat today with the 300 Lapua available.

Well, my sample was probably made in the 90es.

As you know there are several 30 versions of the 338 Lapua.
The sample on the left is a rare factory 300 Lapua magnum round( headstamped L 300 LAPUA MAG) and it is part of a single lot made by Lapua that went almost entirely in Italy. It has a 25° shoulder, the same as the 300 lapua wildcat now made by reforming 338 brass.
The 30-338 Lapua you mentioned was made in Italy too ( maybe in the same time it was developed in the USA) before the advent of factory 300 Lapua brass. It retains the parent shoulder, 20° and here is known ( even if it is an obscure number and cartridges were made only for trials by the italian custom rifle maker Gabriele cardi)as "300 principe". The sample on the right has a 30° shoulder and nobody has ever seen or heard about it. I am sure that other 30-338s exist, such as improved versions with 30-35-40° shoulder angles but with increased shoulder diameters too